NVIDIA GeForce GTX 660 OEM vs AMD Radeon HD 6990

VS

NVIDIA GeForce GTX 660 OEM

AMD Radeon HD 6990

We compared two Desktop platform GPUs: 1536MB VRAM GeForce GTX 660 OEM and 2GB VRAM Radeon HD 6990 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GTX 660 OEM 's Advantages

Released 1 years and 5 months late

Boost Clock888MHz

Lower TDP (130W vs 375W)

AMD Radeon HD 6990 's Advantages

More VRAM (2GB vs 1536GB)

Larger VRAM bandwidth (160.0GB/s vs 134.4GB/s)

384 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GTX 660 OEM

2.046 TFLOPS

Radeon HD 6990 +24%

2.55 TFLOPS

GeForce GTX 660 OEM

VS

Radeon HD 6990

Graphics Card

Aug 2012

Release Date

Mar 2011

GeForce 600

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

823 MHz

Base Clock

-

888 MHz

Boost Clock

-

1400 MHz

Memory Clock

1250 MHz

Memory

1536MB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

192bit

Memory Bus

256bit

134.4GB/s

Bandwidth

160.0GB/s

Render Config

-

Compute Units

24

-

1152

Shading Units

1536

96

TMUs

96

24

ROPs

32

-

16 KB (per SMX)

L1 Cache

8 KB (per CU)

384 KB

L2 Cache

512 KB

-

Theoretical Performance

21.31 GPixel/s

Pixel Rate

26.56 GPixel/s

85.25 GTexel/s

Texture Rate

79.68 GTexel/s

-

2.046 TFLOPS

FP32 (float)

2.550 TFLOPS

85.25 GFLOPS

FP64 (double)

637.4 GFLOPS

Board Design

130W

TDP

375W

300 W

Suggested PSU

750 W

2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2

Outputs

1x DVI 4x mini-DisplayPort 1.2

1x 6-pin

Power Connectors

2x 8-pin

Graphics Processor

GK104

GPU Name

Antilles

GK104-200-KD-A2

GPU Variant

Antilles XT (215-0807027)

Kepler

Architecture

TeraScale 3

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

3.54 billion

Transistors

2.64 billion

294 mm²

Die Size

389 mm²

Graphics Features

12 (11_0)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

3.0

OpenCL

1.2

1.1

Vulkan

N/A

3.0

CUDA

-

5.1

Shader Model

5.0

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